Ashlee A. Martinson is seen in a booking photo provided by the Boone County, Ind., Jail. Sheriff's deputies say Martinson, 17, killed her mother and stepfather and locked her three younger siblings in a room with some food in Rhinelander, Wisc., before fleeing to Indiana with a 22-year-old man. Martinson has been charged with two counts of first-degree intentional homicide in the killings of Jennifer Ayers, 40, and Thomas Ayers, 37, whose bodies were found at their Rhinelander area home on Sunday, March 8, 2015. She is also charged with three counts of false imprisonment. She was arrested Sunday in Boone County, Ind. (AP Photo/Boone County, Ind. Jail) (The Associated Press)

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Ryan Sisco is seen in a booking photo provided by the Boone County, Ind., Jail. Sheriff's deputies say Sisco,, 22, was travelling with Ashlee Martinson, 17, who authorities say killed her mother and stepfather and locked her three younger siblings in a room with some food in Rhinelander, Wisc., before fleeing to Indiana with Sisco. Martinson has been charged with two counts of first-degree intentional homicide in the killings of Jennifer Ayers, 40, and Thomas Ayers, 37, whose bodies were found at their Rhinelander area home on Sunday, March 8, 2015. Sisco has not been charged. Martinson and Sisco were arrested Sunday in Boone County, Ind. (AP Photo/Boone County, Ind. Jail) (The Associated Press)

RHINELANDER, Wis. – A northern Wisconsin teenager is charged with killing her mother and stepfather and trapping her younger siblings in a room.

A criminal complaint filed in Oneida County charges 17-year-old Ashlee Martinson with two counts of first-degree intentional homicide and three counts of false imprisonment.

The complaint says the oldest of the three younger children, a 9-year-old girl, told detectives that Martinson killed Thomas and Jennifer Ayers. The girl told investigators that she heard two gunshots in their home Sunday morning and saw Martinson fighting with her mother.

She told investigators that Martinson later placed her and her two sisters, ages 2 and 8, in a room and tied the door shut.

Martinson and a 22-year-old man were later arrested in Boone County, Indiana, where they remained in jail Tuesday.